Electronic Interface Between Baseband And Camera - Nokia 301 Service Manual

Electronic interface between Baseband and camera

Apart from providing the physical interfacing to various types of camera sensor modules, the CIF block
implements image processing, scaling, and encoding functionality. The integrated image processing unit
supports image sensors with integrated YCbCr processing. Scaling is used for downsizing the sensor data for
either displaying them on the LCD, or for generating data streams for Video compression. In general, YCbCr
4:2:2 JPEG compressed images typically are encode at the full sensor resolution, however they can also be
downscaled to a lower resolution for smaller JPEG files. In combination with a dedicated cropping stage, the
internal scalers are deployed in order to implement a digital zoom effect by upscaling a portion of the sensors
output data.
The CIF block features a MIPI CSI-2 compliant interface. All output data is transmitted via the memory interface
to an AHB bus system using the bus master interface. Programming is done by register read/write
transactions using an AHB slave interface.
The following list summarizes the CIF's features:
• Max. 89 MHz system clock
• Max. 178 MHz JPEG encoder clock
• 32-bit AHB slave programming interface
• ITU-R BT 601 compliant video interface supporting YCbCr data
• ITU-R BT 656 compliant video interface supporting YCbCr data
• Flash light control• Mechanical shutter support
• 12-bit resolution per color component internally
• YCbCr 4:2:2 processing
• Hardware JPEG encoder incl. JFIF1.02 stream generator and programmable quantization and Huffman
tables
• Windowing and frame synchronization
• Continuous resize support
• Frame skip support for video (e.g. MPEG-4) encoding
• Macro block line, frame end, capture error, data loss interrupts and sync. (h_start, v_start) interrupts
• Programmable polarity for synchronization signals
• Luminance/chrominance and chrominance blue/red swapping for YUV input signals
• Maximum input resolution of 3.1 Mpixels (2048x1536 pixels)
• Main scaler with pixel-accurate up- and down-scaling to any resolution between 3.1 MP (2048x1536) and
32x16 pixel in processing mode
• Buffer in system memory organized as ring-buffer
• Buffer overflow protection for raw data and JPEG files
• Asynchronous reset input, software reset for the entire IP and separate software resets for all submodules
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RM-839; RM-840; RM-841
System Module
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